Astrophysical: Active galactic nuclei

  • Publication
    Steps toward determination of the size and structure of the broad-line region in active galactic nuclei. IV - Intensity variations of the optical emission lines of NGC 5548
    Measurements of optical emission-line flux variations based on spectra of the Seyfert galaxy NGC 5548 obtained between December 1988 and October 1989 are...
  • Publication
    Steps toward determination of the size and structure of the broad-line region in active galatic nuclei. 8: an intensive HST, IUE, and ground-based study of NGC 5548
    We present the data and initial results from a combined Hubble Space Telescope (HST)/IUE/ground-based spectroscopic monitoring campaign on the Seyfert 1 galaxy...
  • News
    Supermassive black holes change the central regions of galaxies
    Cristina Ramos Almeida, a researcher at the Instituto de Astrofísica de Canarias (IAC), has led research which used data from the ALMA telescope in Chile to...
  • Publication
    Testing the anisotropy of the central engine from extended emission line regions
    Predictions about the angular behavior of the emission line spectrum from the ENLR for three plausible models of the nuclear engine are presented. Results are...
  • Publication
    The Cavity of 3CR 196.1: Hα Emission Spatially Associated with an X-Ray Cavity
    We present a multifrequency analysis of the radio galaxy 3CR 196.1 (z=0.198), associated with the brightest galaxy of the cool-core cluster CIZAJ0815.4-0303...
  • Publication
    The central parsecs of AGN across the electromagnetic spectrum
    High angular resolution observations across the electromagnetic spectrum of the nearest AGN are providing a view of the nuclear region rather different from-...
  • Publication
    The circumstellar region of NGC 5728
    A 2D array of optical fibers generating simultaneous spectral and spatial information has been used to observe the central 13 arcsec of NGC 5728; on this basis...
  • Publication
    The complex narrow line region in NGC 4151
    New narrow band images of NGC 4151, taken in excellent seeing conditions with the 4.2-m William Herschel Telescope on La Palma are presented. These reveal a...
  • Publication
    The complex narrow-line region in NGC 4151
    New narrow-band images of NGC 4151, taken in excellent seeing conditions with the 4.2-m William Herschel Telescope are presented. These reveal a wealth of...